Stop for rotating parts



NQVrB, 1931. M sHlNKLE 1,830,135

STOP FOR ROTATING PARTS Filed June 19, 1929 s Sheets-Sheet 1 gwumtoz Nov. 3, 1931. E. M. SHINKLE STOP FOR ROTATING PARTS Filed June 19,. 1929 S Sheets-Sheet 2 gn uento'c Edwar M- Eh'mkle VI] llll Nov; 3, 1931. v E. M. SHINKLE 3 3 STOP FOR ROTATING PARTS Filed June 19, 1929 s Sheets-Sheet s gwwntoz E :[wa'rd NLEhinkle Patented Nov. 3, 1931 UNITED STATES EDWARD M. SHINKLE, F HIGGINSPORT, OHIO s'ror roanorairino PARTS Application filed June 19, 1929. Serial No. 372,058.

(GRANTED UNDER THE ACT OF MARCH 3, 1883, AS AMENDED APRIL 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, Without the payment to meof any royalty. thereon.

The subject of this invention is a stop for rotating parts. i

Thisinvention relates generally to mechanism for preventing rotation of a driven member in one direction and more especially to means mounted adjacent to a shaft, pinion or the like for preventing its rotation save, in a' given direction, that is, clockwise or counterclockwise, as the case may be.

in and further development of the invention disclosed in Patent No. 1,625,571, granted to me April 19, 1927.

The main objects of the invention are the provision of means associated with a'sliding gear forprohibiting the movement of the gear in one direction or theother. 1

A further object of the invention is the provision of means for preventing the prohibiting means from operating while the moving parts retain sufficient speed to cause damage, such means furnishing a simple and novel structure for rendering the device inoperative. i

These objects are accomplished bv providing a gear locking member slidable in unison with the sliding gearand an element movable on the locking member control but restrained from movement during selective movements of the locking member.

With these and such other objects in View as may hereinafter more fully appear, the invention resides in the novel arrangement and combination of parts and in' the details of construction hereinafter described and claimed, it being understood, however, that changes in the preciseembodiment of the invention herein disclosed may be made within the scope of the claims without departing from the spirit of the invention.

In the accompanying drawings. in which practical embodiments of the invention are disclosed by way of illustration: i

Fig. 1 is a View in side. elevation of alientomcbile transmission, part of the sidewall ,modified form of the device;

This invention constitutes an improvement Fig. 7 is a transverse vertical section of the;

m'odified form of the control Fig. 3 is a detail sectional view illustrating the gear locking member and its control element, theparts shown in neutral position;

Fig. 4 is a similar view, the parts shownin first speed forward position; I i Fig. 5 is a similar view, the parts in reverse position;

-Fig. 6 is a horizontal section illustrating a same; 1

Fig. 8 is a horizontal section illustrating. a still further modification; r

Fig. 9 is a transverse vertical sectionof the same;

Fig. 10 is a detail sectionalview of gear locking member;

Fig. 11 is a fragmentary plan view of the control, partly in section; i

Fig. 12 is a section taken on the line 1 2 12 of Fig. 11; v

' Fig. .13 is a fragmentary the plan view of a Fig. 14 is a section on the line 14-14 of Fig. 13;

Fig. 15 is a. view in elevation of the shifting fork for the slidable gear and locking member.

As will be seen from the appended claims, while for the purpose of convenience, the invention has been illustrated in connection with a transmission mechanism,,the same is not so limited. The words used in the description should beconsidered in their descriptive and not in their limiting sense.

In the embodiments of the invention herein shown, the stop mechanism preferably comprises a gear locking member which may conveniently be a pivotally and slidably mounted pawl 1 which may be formed with a pair of gear engaging teeth 2 and 3. To maintain thelocking member from movement in one direction or the other, there is preferably employed a control bar 4, which, as illus trated, is adapted to pass through a slot 5 provided in the locking member.

In the particular construction here illustrated, the locking member 1 is designed to cooperate with the gear 11 which is slidable on the shaft 8 to selectively mesh with first speed fO1\V 1lCl OT I'GVQI'SG gears.

Referring to the specific application of the invention as a safety stop for automobiles, the transmission housing or case 12 is provided with a bracket 13 which forms a support for one end of a shaft 14, the other end of which may be conveniently supported in a wall of the housing 12, and on which shaft the locking member is mounted for sliding and rocking movement. The locking member is mounted to rock transversely of the housing and in the plane of a shiftable gear, preferably, though not necessarily, thelgear 11. The locking member is provided with a flanged hub engaged by the shifting fork 16, preferably formed integral with the fork 15 which shifts the gear 11.

The control bar 4 is mounted on brackets, as shown, or in other convenient manner within the housing 12 and is formed with the laterally offset portion 17 on one side and a laterally offset portion providing the for wardlv facing shoulder 18 on the other. The shoulder 18 provides a stop against which a sliding element or block 19 is adapted to come to rest when the gear is shifted to reverse position, as seen most clearly in Fig. 5. The element 19 may be provided with dovetailv grooveadapted to receive a tongue formed on the control bar 4- as indicated most clearly at 20, Fig. 12. The element 19 may be provided with a projection 23 to insure the element being picked up and carried rear ward by the locking member 1 when such member is moved to its rearmost position (which is reverse position) and with a spring actuated detent 22 at its forward end engaged by the member 1 on its forward movement to carry the element to its extreme forward position where it is brought to rest by a stop 21 secured to the control bar 41. As will be readily apparent from a consideration of the structure, the rearward movement of the element 19 is for the purpose of preventing the locking member operating to lock the gear against reverse movement while leaving it free to lock a gainstforward movement see Fig. 5, while the subsequent forward movement of the element 19 is for the purpose of placing the element in such position as to prevent operation of the locking member while neutral position is then maintained see 3. The detent 22 and block 21 allows the looming member and gear to be shifted to first speed forward without disturbing the element 19, but engages the locking member when shifted back to ne al from s ch first speed forward positie l that the element 19 is moved rearwardly sufficiently to permit thg locking member to operate against reverse movement. These positions are illustrated most clearly in Figs. 1 and 5.

The locking member may be provided with plates adapted to embrace the gear 11 one of which, 24, is recessed to receive a friction plate 25 held in contact with the gear 11 by a resilient element 26. This frictional contact assures the locking member being moved in a direction opposite to the direction of rotation of the gear 11.

The operation of the device is as follows: Tit/h the gears in neutral position, having moved to that position from reverse, as shown in Fig. 3, the locking member is held against operation by the block 19 and the offset portion 17 of the bar 4. With the gears in reverse, as shown in Fig. 5, the locking member 1 is held by the element 19 against locking the gear to prevent reverse movement but is free to lock the gear against forward movement. lVith the gears in first speed forward, seen in Fig. 1, the locking member is held by the control bar 4 from operating to lock the gear against forward movement but is free to lock against reverse movement, the element 19 having been left at neutral position. hen the parts return from the position shown in Fig. 4 to neutral, the locking member contacts the detent 22 and moves the element 19 sufficiently to permit operation of the locking member against reverse, which condition is maintained during all shifts of the gears until a shift to reverse is again made.

In the modification shown in Figs. 6 and 7, a lever 27 is .pivotally mounted on one arm of a T bracket 29 and one end of the lever is in position to be engaged by the gear shift lever 32 when shifted to engage the fork controlling the shiftable gear which gives second and third speeds forward, while the other end engages an arm of a bell crank lever 28. also pivoted on the T bracket 29, the other end of which lever engages the element 19. so that, when shifts to second or third speed forward are made the element 19 is moved to permit the locking member to operate against reverse movement even though a shift from reverse to either second or third speed forward be made without passing through first speed forward.

In Figs. 8 and 9 a still further modification for the same purpose is illustrated. In this instance the element 19 is integral with or mounted on a bar 81, the angled forward end of which is adapted to be contacted by a finger 30 projecting from the shifting fork which shifts the gear giving second or third speed forward. When this gear is shifted to secend speed forward the finger 30 will. push the rod 31and element 19 rearwardly in which p; ition it will beleft until picked up again by reason of shifting to reverse.

13 and 14 show a modification of the device shown in o ill) dovetail bar 31 fits in the groove formed in the control bar 4 and the element 19 is formed integral with or is secured to such bar 31.

I claim: I

1. In a device of the character described, the combination with a rotatable element, of a double ended pawl pivotally mounted adj acent said element, means rotatable with and slidable on said element adapted to be engaged by either end of said pawl, and means for positively positioning said pawl to prevent revolution of said element in one direction, said means including means for restraining the said pawl from operation.

2. In a device of the character described, the combination with a rotatable element, of a pawl pivotally mounted adjacent said element, means rotatable with and slidable on said element adapted to be engaged by said pawl, and means for positively positioning said pawl to prevent revolution of said element in one direction, said means including means for restraining the saidpawl from operation.

3. In a device of the character described, the combination with a rotatable and sliding gear, of a member pivotally mounted adjacent to said gear and slidabletherewith adapted to engage the same to prevent motion thereof in one direction or the other.

4. In a device of the character described, the combination with a rotatable and sliding gear, of a member adjacent to said gear adapted to engage the same, and means for controlling said member to prevent motion of the gear in one direction or the other, said means including means for restraining the member from operation.

5. In a device of the character described, the combination with a rotatable and slidable gear, of a member slidable in unison with the gear associated with said gear and cooperating therewith to cause the member to lock the gear against movement in either direction, and means engaging the member to restrain the same from looking the gear against move ment in one direction or the other.

6. In a device of the character described, the combination with a rotatable and slidable gear, of a member slidable in unison with the gear associated with said gear and cooperating therewith to cause the member to lock the gear against movement in either direction, and means engaging the member to restrain the same from locking the gear either against movement in one direction or against movement in either direction.

against movement in one direction or against movement in either direction, and means for actuating the restraining means to permit the locking member to lock the gear against movement in one direction.

EDWARD M. SHINKLE.

7. In a device of the character described, I

the combination with a rotatable and slidable gear, of a member slidable in unison with the gear associated with said gear and cooperating therewith to-cause the member to lock the gear against movement in either direction, means engaging the member to restrain the same from looking the gear either 

